fix useless related_user setting

sync/admin.py

@@ -8,8 +8,8 @@ class SyncedObjectAdmin(admin.ModelAdmin):
         if isinstance(obj, BaseModel):
             obj.last_updated_by = request.user
             obj.last_update = timezone.now()
-            if obj.related_user is None:
-                obj.related_user = request.user
+            # if obj.related_user is None:
+            #     obj.related_user = request.user
         super().save_model(request, obj, form, change)
 
     def delete_model(self, request, obj):